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Linus Torvalds 8c0863403f dirty page balancing: Get rid of broken unmapped_ratio logic 
This code harks back to the days when we didn't count dirty mapped
pages, which led us to try to balance the number of dirty unmapped pages
by how much unmapped memory there was in the system.

That makes no sense any more, since now the dirty counts include the
mapped pages.  Not to mention that the math doesn't work with HIGHMEM
machines anyway, and causes the unmapped_ratio to potentially turn
negative (which we do catch thanks to clamping it at a minimum value,
but I mention that as an indication of how broken the code is).

The code also was written at a time when the default dirty ratio was
much larger, and the unmapped_ratio logic effectively capped that large
dirty ratio a bit.  Again, we've since lowered the dirty ratio rather
aggressively, further lessening the point of that code.

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-11-15 16:41:52 -08:00
..
allocpercpu.c Slab allocators: Replace explicit zeroing with __GFP_ZERO 2007-07-17 10:23:02 -07:00
backing-dev.c mm: per device dirty threshold 2007-10-17 08:42:45 -07:00
bootmem.c
bounce.c block: Initial support for data-less (or empty) barrier support 2007-10-16 11:03:56 +02:00
fadvise.c
filemap.c Remove broken ptrace() special-case code from file mapping 2007-10-31 09:19:46 -07:00
filemap_xip.c mm: write iovec cleanup 2007-10-16 09:42:54 -07:00
fremap.c remap_file_pages: kernel-doc corrections 2007-10-17 08:43:07 -07:00
highmem.c Create the ZONE_MOVABLE zone 2007-07-17 10:22:59 -07:00
hugetlb.c hugetlb: fix i_blocks accounting 2007-11-14 18:45:40 -08:00
internal.h Breakout page_order() to internal.h to avoid special knowledge of the buddy allocator 2007-10-16 09:43:01 -07:00
Kconfig small documentation fixes 2007-10-20 02:46:58 +02:00
madvise.c speed up madvise_need_mmap_write() usage 2007-07-16 09:05:36 -07:00
Makefile memory unplug: page isolation 2007-10-16 09:43:02 -07:00
memory.c Swap delay accounting, include lock_page() delays 2007-11-14 18:45:44 -08:00
memory_hotplug.c Add IORESOUCE_BUSY flag for System RAM 2007-11-14 18:45:39 -08:00
mempolicy.c Migration: find correct vma in new_vma_page() 2007-11-14 18:45:38 -08:00
mempool.c spelling fixes: mm/ 2007-10-20 01:27:18 +02:00
migrate.c Typo fixes retrun -> return 2007-10-20 02:13:26 +02:00
mincore.c
mlock.c do not limit locked memory when RLIMIT_MEMLOCK is RLIM_INFINITY 2007-07-16 09:05:37 -07:00
mmap.c fix mprotect vma_wants_writenotify prot 2007-10-23 08:32:06 -07:00
mmzone.c
mprotect.c fix mprotect vma_wants_writenotify prot 2007-10-23 08:32:06 -07:00
mremap.c sparse pointer use of zero as null 2007-10-18 14:37:31 -07:00
msync.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
nommu.c NOMMU: mm/nommu.c needs linux/module.h 2007-10-29 07:53:26 -07:00
oom_kill.c oom_kill bug 2007-10-20 15:04:06 -07:00
page-writeback.c dirty page balancing: Get rid of broken unmapped_ratio logic 2007-11-15 16:41:52 -08:00
page_alloc.c Revert "Bias the placement of kernel pages at lower PFNs" 2007-11-12 14:14:44 -08:00
page_io.c Drop 'size' argument from bio_endio and bi_end_io 2007-10-10 09:25:57 +02:00
page_isolation.c memory hotremove: unset migrate type "ISOLATE" after removal 2007-11-14 18:45:38 -08:00
pdflush.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
prio_tree.c spelling fixes: mm/ 2007-10-20 01:27:18 +02:00
quicklist.c
readahead.c mm: bdi init hooks 2007-10-17 08:42:45 -07:00
rmap.c Migration: find correct vma in new_vma_page() 2007-11-14 18:45:38 -08:00
shmem.c fix tmpfs BUG and AOP_WRITEPAGE_ACTIVATE 2007-10-30 08:06:55 -07:00
shmem_acl.c
slab.c slab: fix typo in allocation failure handling 2007-11-14 18:45:36 -08:00
slob.c slob: fix memory corruption 2007-11-15 08:36:27 -08:00
slub.c SLUB: killed the unused "end" variable 2007-11-12 10:32:29 -08:00
sparse-vmemmap.c mm/sparse-vmemmap.c: make sure init_mm is included 2007-10-30 08:06:55 -07:00
sparse.c Revert "x86_64: allocate sparsemem memmap above 4G" 2007-10-29 14:05:37 -07:00
swap.c spelling fixes: mm/ 2007-10-20 01:27:18 +02:00
swap_state.c mm: clarify __add_to_swap_cache locking 2007-10-16 09:42:53 -07:00
swapfile.c Replace CONFIG_SOFTWARE_SUSPEND with CONFIG_HIBERNATION 2007-07-29 16:45:38 -07:00
thrash.c Bug in mm/thrash.c function grab_swap_token() 2007-05-11 08:29:32 -07:00
tiny-shmem.c r/o bind mounts: filesystem helpers for custom 'struct file's 2007-10-17 08:43:04 -07:00
truncate.c Drop some headers from mm.h 2007-10-17 08:42:55 -07:00
util.c fix mm/util.c:krealloc() 2007-11-14 18:45:41 -08:00
vmalloc.c spelling fixes: mm/ 2007-10-20 01:27:18 +02:00
vmscan.c spelling fixes: mm/ 2007-10-20 01:27:18 +02:00
vmstat.c vmstat: fix section mismatch warning 2007-11-14 18:45:42 -08:00